Fixed ticket #1075 for lil_matrix, added fancy slice indexing and added test
to confirm 1075 was fixed and fixed slicing tests.
Added test to test_lil_sequence_assignment and fixed code to pass test.
Attempted to fix bugs seen with sparse_test_class()
Fixed another thing for S[1:5, 0] = range(1, 5)y
Integrated test_base.py from gh-426, added tests for new indexing and added
matrix indexing functioning.
BUG: Fix the automatic frequency selection of scipy.signal.bode.
The automatic selection of the frequencies could miss zeros or resonance peaks, so use the existing function scipy.signal.findfreqs instead of _default_response_frequencies.

Specific changes:
* Modifed the function scipy.signal.bode to use scipy.signal.freqs.
* Added a docstring to scipy.signal.findfreqs.
Updated test suite based on pull request comments. Still needs fixing at
line 1227 where C is undefined.
Updated code using ravel() and now able to set values based on an array. A
tradeoff has to be made between code duplication and memory usage. Making
everything into the same shape would be the most elegant, but A[:, :] = 1
would generate three arrays (i, j, x) all having the same size as A. If there
is desire to simplify the code, that can be easily done.
Rewrote __getitem__ to be more readable and reduce code duplication.
Copied code from __getitem__ to __setitem__ . This fixes one error in
test_base and brings up a new error:

line 1172
A[1:3, 1] = [[10], [20]]
now works

line 984
A[1:5, 0] = range(1, 5)
is now broken

line 984 does not work for NumPy matrix objects, so I think that test should
be deleted. I'm leaving that alone for now.
Fix byte order used to interpret strings in Matlab reader
Fix writing arrays to matlab with wrong byte order
Test reading and writing of big-endian data
Changed most of the try: ... except *Error: ... blocks
into assert_raises(*Error)
Fixed and expanded test_fancy_assign_ndarray
Expanded _TestFancyMultidimAssign to ensure proper test coverage
Expanded the test coverage for slices
BUG: special: multigammaln returned wrong size array (closes ticket #1849)
TST: sparse: clean up the test suite

Move indexing tests to appropriate classes splitting some of them into
parts. Remove duplicated tests. Remove dead code. Fix typos.
MAINT: sparse/lil: remove dead code